5-34
S
To calculate the focus and length of latus rectum
[G-SLV]-[FOCS]/[LEN]
Example
To determine the focus and length of latus rectum for the parabola X =
(Y – 2)
2
+ 3
Use the following V-Window settings.
Xmin = –1,
Xmax = 10, Xscale = 1
Ymin = –5,
Ymax = 5, Yscale = 1
K
CONICS
U
@
U
A
U
B
U
(DRAW)
(G-SLV)
(FOCS)
(Calculates the focus.)
(G-SLV)
(LEN)
(Calculates the length of latus rectum.)
• When calculating two foci for an ellipse or hyperbolic graph, press
C
to calculate the
second focus. Pressing
B
returns to the first focus.
• When calculating two vertexes for a hyperbolic graph, press
C
to calculate the second
vertex. Pressing
B
returns to the first vertex.
• Pressing
C
when calculating the vertices of an ellipse will calculate the next value.
Pressing
B
will scroll back through previous values. An ellipse has four vertices.
S
To calculate the center
[G-SLV]-[CNTR]
Example
To determine the center for the circle
(X + 2)
2
+ (Y + 1)
2
= 2
2
K
CONICS
AAAA
U
A
U
@
U
A
U
(DRAW)
(G-SLV)
(CNTR)
(Calculates the center.)
Summary of Contents for FX-7400GII
Page 337: ...E CON2 Application ...